CN1701856A

CN1701856A - Highly efficient liquid-liquid hydrocyclone with low energy consumption

Info

Publication number: CN1701856A
Application number: CN 200510082680
Authority: CN
Inventors: 赵庆国
Original assignee: Beijing University of Technology
Current assignee: Beijing University of Technology
Priority date: 2005-07-08
Filing date: 2005-07-08
Publication date: 2005-11-30
Anticipated expiration: 2025-07-08
Also published as: CN100512972C

Abstract

This invention concerns high-efficiency liquid-liquid hydrcyoclone with low consumption of . The cyclone comprises an overflow pipe (1) with inlet size Do/D of 0.1-0.2, cyclone inlet (2) with section shape of cycloid or catenary and equivalent diameter 0.3-4 times of cyclone nominal diameter, cylinder segment (3) with size of Lc/D 2-3, steep segment (4) with cone angle of 8-25Deg, bevel segment (5) with cone angle of 1.5-6Deg, and liner segment (6) with size of Lu/D 20-40. This cyclone can used to separate oil-water mixture with inlet concentration less than 20%; compared with traditional cyclones, it has advantages of high efficiency, low pressure drop and wide application range.

Description

The highly efficient liquid-liquid hydrocyclone of low energy consumption

Technical field

The present invention is a kind of sewage degrease hydrocyclone, is applicable to the separation of processing oil-polluted water and other lightweight disperse phase liquid liquid, liquid-liquid-solid, liquid liquid vapour mixture, belongs to a kind of cyclone.

Background technology

The water-oil separating hydrocyclone is the bicone structure, as shown in Figure 1, comprises overflow pipe 1, cyclone inlets 2, cylindrical section 3, large cone section 4, small cone section 5 peaceful end of line pipeline sections 6.According to people's such as Thew patent (CA119111, US4576724), it is 0.1 times less than cyclone diameter of 20 '～1 °, overflow diameter that asymptote form, small cone section semi-cone angle are adopted in the import cross section.This cyclone can be used for separating the oil water mixture of split ratio 0.5～10%, and separative efficiency depends on the size of cyclone, the size of droplet diameter and the density contrast of profit two-phase.The cyclone of present domestic employing all is the external product of introducing basically.At marine petroleum exploitation, exploitation by land, various wastewater treatment, pharmaceutical industry extract and be extracted a lot of occasions such as separating of liquid and face all that the two-phase density contrast is little, situation such as low requires to consume energy, in these cases, need further to improve separating power, the reduction pressure drop of cyclone.

Summary of the invention

The objective of the invention is to propose the cyclone of a kind of separating power height, energy consumption little (pressure drop is little).In order to reach this purpose, the scheme that hydrocyclone adopted of the present invention's design is: comprise overflow pipe 1, cyclone inlets 2, cylindrical section 3, large cone section 4, small cone section 5, tailpipe section 6 is characterized in that: the import cross sectional shape is cycloid or catenary form, and big cone angle is 8～25 °, small-angle is 1.5～6 °, and the equivalent diameter in import cross section is 0.3～4 times of nominal diameter of hydroclone D. Tailpipe section length is 20～40 times of nominal diameter of hydroclone D; Overfall is of a size of 0.1～0.2 times of nominal diameter of hydroclone D; 2～3 of cylindrical section size nominal diameter of hydroclone D.Doubly.Wherein:

D-nominal diameter of hydroclone (large and small awl section is connected diameter of section);

D ₀-overflow diameter;

L _u-tailpipe section length;

L _c-cylindrical section length.

Design principle of the present invention is: change any one physical dimension or version and can change the separating power of hydrocyclone, also can change the pressure drop of cyclone.But from improving the angle of separating power, the change of cyclone awl section cone angle directly influences separated space and the fluid size in the segregation section time of staying, so having the greatest impact to separating power, and after this cone angle change, the design correlation of traditional Thew type cyclone will be no longer suitable.Theoretical research according to us shows, is not that the more little separating power of cone angle is just high more, as shown in Figure 6: as small cone section semi-cone angle α ₁During increase, cut size d ₅₀At first with α ₁Increase and increase (expression with α ₁The increase separating power reduce); When being increased to certain degree, continue to increase α again ₁Can cause d on the contrary ₅₀Reduce, the expression separating power is improving.Among the figure:

d ₅₀---cut size, expression are 50% o'clock drop size corresponding to separative efficiency;

α ₁---the small cone section semi-cone angle;

h ₁---small cone section length.

Angle from pressure drop, each physical dimension of cyclone and version all may change the size of pressure drop, wherein the pressure drop of cyclone awl section represent between the kinetic energy of Disengagement zone fluid and the static energy and is changed energy needed, and the unexpected variation needed droop loss of inlet fluid because of flow section and flow channel shape represented in import to the pressure drop between the cylinder one large cone section linking cross section.Therefore the awl section pressure drop size that accounts for the ratio of overall presure drop has been reacted the size that is used for the energy proportion that effectively separates in the energy of a cyclone consumption, and this ratio is high more, just represents " effective energy is high more " in the cyclone pressure drop.Between this two parts pressure drop, import form and inlet size are very big to the influence of droop loss.

Application scenario of the present invention comprises that water purification is drunk in the presorting of oil extraction liquid, the purification of oil-polluted water, the oil removing in the municipal sewage, dining room, dairy products remove grease, remove the separation of extract in printing ink, the pharmaceutical industry etc. from paper pulp.Hydrocyclone of the present invention can be used for separating the oil water mixture of inlet concentration less than 20% (split ratio is greater than inlet concentration), and is lower, applied widely than traditional cyclone separative efficiency height, pressure drop.

Description of drawings

Fig. 1 hydrocyclone structure schematic diagram;

Fig. 2 cycloid import schematic diagram;

Fig. 3 catenary import schematic diagram;

Fig. 4 hydrocyclone structure schematic diagram of the present invention;

Fig. 5 cyclone inlets section form of the present invention figure;

Fig. 6 small cone section semi-cone angle is to cut size d ₅₀Influence;

Pressure drop under the various inlet forms of Fig. 7;

The pressure drop of Fig. 8 section of awl accounts for the ratio of overall presure drop;

Among the figure, 1-overflow pipe, 2-cyclone inlets, 3-cylindrical section, 4-large cone section, 5-small cone section, 6-tailpipe section.

The specific embodiment

Specify the preferred embodiments of the present invention below in conjunction with accompanying drawing:

A kind of cyclone form of the present invention's design, structure is referring to Fig. 4, and the import cross sectional shape is referring to Fig. 2.The import cross sectional shape of the cyclone of this form is the cycloid import, big cone angle is 10 °, small-angle is 1.5 °, overflow diameter is 4mm, nominal diameter of hydroclone is 30mm, and the cylindrical section height is 60mm, and import cross section equivalent diameter is 13mm, the tailpipe section diameter is 15mm, and tailpipe section length is 600mm.Adopt this kind cyclone form, at inlet flow rate 4m ³/ h, split ratio are under 8% the condition, to be used for water-oil separating, and separative efficiency has improved 4.1% than Thew type cyclone, and pressure drop ratio Thew type cyclone has improved 7.6%.

The another kind of cyclone form of the present invention's design, structure is referring to Fig. 4, and the import cross sectional shape is referring to Fig. 3.The import cross sectional shape of the cyclone of this form is for revolving the chain line import, big cone angle is 10 °, small-angle is 1.5 °, overflow diameter is 4mm, nominal diameter of hydroclone is 30mm, and the cylindrical section height is 60mm, and import cross section equivalent diameter is 13mm, the tailpipe section diameter is 15mm, and tailpipe section length is 600mm.。Adopt this kind cyclone form, at inlet flow rate 4m ³/ h, split ratio are under 8% the condition, to be used for water-oil separating, and separative efficiency has improved 10.6% than Thew type cyclone, and pressure drop ratio Thew type cyclone has reduced by 36.1%.

Specify the effect contrast of cyclone of the present invention and existing Thew type involute cyclone below in conjunction with accompanying drawing.

What table 1 provided is under different import forms, and big cone angle is that 10 °, small-angle are that 1.5 °, overflow diameter are 4mm, inlet flow rate 4m ³/ h, split ratio are under 8% the condition, are used for the actual measurement mask data of water-oil separating, and as can be seen, from the correction data of separative efficiency, the separative efficiency of cycloid and catenary all is higher than the involute form that Thew adopts.

Separative efficiency under the different import forms of table 1

The import form	Separative efficiency
The import form	Separative efficiency	Involute	??56.4
Cycloid	??58.7	Involute	??56.4
Cycloid	??58.7	Catenary	??62.4

What Fig. 7 provided is the contrast of the pressure drop under three kinds of condition for imports of above-mentioned condition of surveying, as can be seen from the figure, cycloid is consistent basically with the pressure drop of involute inlet form, but the pressure drop of catenary intake swirler is starkly lower than the inlet form of cycloid and involute.

Fig. 8 is the ratio that the pressure drop of three kinds of import form lower cone sections accounts for overall presure drop because it represent the size of " effective energy " in the cyclone pressure drop, so from this figure equally as can be seen, the catenary form is best, involute takes second place, cycloid is relatively poor.

The The above results explanation: on separating property, cycloid of the present invention and catenary import form all are better than the involute form; From the pressure drop angle, catenary inlet form is best, and cycloid is consistent basically with the pressure drop of involute form.

Claims

1, a kind of highly efficient liquid-liquid hydrocyclone of low energy consumption, comprise overflow pipe (1), cyclone inlets (2), cylindrical section (3), large cone section (4), small cone section (5), tailpipe section (6), it is characterized in that: the cross sectional shape of cyclone inlets (2) is that cycloidal or stretched wire are linear, and the big cone angle of large cone section (4) is 8～25 °, and the small-angle of small cone section (5) is 1.5～6 °.

2, the highly efficient liquid-liquid hydrocyclone of low energy consumption according to claim 1 is characterized in that: the overfall dimension D _o/ D is 0.1～0.2; Wherein,

The D-nominal diameter of hydroclone, promptly large and small awl section is connected diameter of section;

D _oThe diameter of-overflow pipe (1).

3, the highly efficient liquid-liquid hydrocyclone of low energy consumption according to claim 1 is characterized in that: the import cross section equivalent diameter of cyclone inlets (2) is 0.3～4 times of nominal diameter of hydroclone.

4, the highly efficient liquid-liquid hydrocyclone of low energy consumption according to claim 1 is characterized in that: tailpipe section size L _u/ D is 20～40, wherein,

L _uThe length of-tailpipe section (6).

5, the highly efficient liquid-liquid hydrocyclone of low energy consumption according to claim 1 is characterized in that: cylindrical section size L _c/ D is 2～3, wherein,

L _cThe length of-cylindrical section (3).